could you come with me,please?这里为什么用could 而不用can 呢?

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• could you come with me,please?这里为什么用could 而不用can 呢?
• Could you please tell me when he will come 为什么用will而不是would
• could you come with me,please?这里为什么用could 而不用can 呢?
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